AI cold email first line personalizer for a lead list
In short: Drop a lead CSV, get one opening line per row in a new first_line column, and see how many addresses look undeliverable before you send. Limit: AI output can be wrong or bland. Read every line before you send or import it.
An AI cold email first line personalizer reads each lead's name, company, title, website and notes, then writes one opening sentence for the email. This tool does that for a whole CSV and adds a first_line column to download. It also checks the addresses for bad syntax, typo domains and disposable providers first. Free for 25 rows signed out and 200 signed in.
First lines written? Check which addresses will bounce.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. Check your list free nowSee pricing
Free: up to 25 rows signed out, 200 signed in.
Sample result
A lead with a note gets that note as the first line, and the page counts the bad addresses.
- List check
- 1 of 2 look undeliverable
- Typo domain
- gmial.com
- Lines written
- 2
What this means for you
Review every line before you send. Addresses are checked for shape and mail servers, not mailboxes.
- One line per lead in a first_line column
- Uses only what the row says
- Checks the email column first
- Works without AI, with plain lines
- CSV
- First line
- Verify
By SimpleVerifier Team · Last updated
How do I check every address before the personalised emails go out?
- Run the CSV above, and read the line about undeliverable addresses.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I write a first line for every lead in a CSV?
- Paste or upload a CSV with a header row. Useful columns are name, company, title, website, notes and email.
- Press the write button. The page first checks the email column and tells you how many addresses look undeliverable.
- Read the lines in the preview. Rows with a note get the best lines, because the note is the only real detail the writer has.
- Download the CSV, which is your file plus a first_line column, and map first_line to a merge field in your sequencer.
- Verify the whole list before you send, so the personal lines go to mailboxes that exist.
Example
- You enter
- Two leads: one with the title
VP Sales, companyNorthwind Tradersand the noteOpened a second warehouse this spring, one with only a company,Contoso Health. Both have an email column, and one address issam@gmial.com. - You get
- With AI mode off:
Opened a second warehouse this spring.for the first lead andI came across Contoso Health and wanted to reach out.for the second, in a new first_line column. The page also reports that 1 of 2 addresses looks undeliverable, because gmial.com is a typo domain. - Limits
- Up to 25 rows signed out and 200 signed in. The address check reads syntax, typo domains, disposable providers and mail servers, not mailboxes.
How does an AI first line personalizer work?
For each row the tool sends the name, company, title, website and notes to a language model with strict instructions: one plain sentence, only facts that are in the row, no invented compliments. Your text is passed as data, so a lead note that says "ignore your instructions" is treated as a note, not a command. Email addresses are not sent.
The quality of a line depends on the detail in the row. A row with a note such as a recent hire or launch gives the writer something real to use. A row with only a title and company gets a plain line that names the role, because there is nothing true to add.
What happens when AI mode is off?
The tool still works. Without AI it builds each line from the row's own fields: your note if there is one, otherwise the title and company, otherwise the company or website. These lines are plain and repeat a pattern, so they are a starting point, not a substitute for a real note. The page says when AI mode is not available yet.
Why check the addresses before writing personal lines?
A personal opening line is wasted on an address that bounces, and bounces hurt the sending domain more than a bland first sentence does. Google's sender guidelines tell bulk senders to keep spam complaints low and to send to people who want the mail, which starts with addresses that exist. The check here reads syntax, typo domains such as gmial.com, disposable providers and domains with no mail server. It does not check mailboxes; verify the list for that.
Pair it with the personalization line builder when you want fixed rules instead of AI, and read how to personalise cold email at scale.
Who uses this tool, and for what?
- Founders doing outbound
- Add one honest opening line per lead without writing 200 of them by hand.
- SDRs
- Turn a Sales Navigator or Apollo export plus a column of notes into a first_line merge field.
- Agencies
- Draft first lines for a client list, then hand over a CSV that is checked for bad addresses.
What can’t this tool tell you?
- AI output can be wrong or bland. Read every line before you send or import it.
- A line can only use what is in the row. It cannot browse the lead's website or LinkedIn.
- The address check cannot say whether a mailbox exists. Only a mailbox check can.
- Free runs are capped by rows, by hour and by day.
Common questions
- What columns does the CSV need?
- A header row, and any of name, company, title, website, notes and email. The more detail a row has, the better its line. An email column lets the page check the list and carry it into verification.
- How many rows can I run for free?
- 25 rows signed out and 200 signed in. AI runs are also limited per hour and per day to keep the tool free.
- Is my list sent anywhere?
- Without AI, nothing leaves your browser except domain names for the address check. With AI mode on, name, company, title, website and notes are sent to an AI provider through our server. Email addresses are not.
- Will the lines invent facts about my leads?
- The writer is told to use only what is in the row and to stay neutral when there is little to say. It can still get things wrong, so read every line before you send.
- Does this check that the email addresses work?
- It checks syntax, typo domains, disposable providers and mail servers, not mailboxes. A mailbox check on the whole list is the next step.
Sources
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.